材料科学
高温合金
电子背散射衍射
晶界
冶金
停留时间
变形(气象学)
变形机理
粒度
巴黎法
腐蚀
复合材料
裂缝闭合
断裂力学
微观结构
医学
临床心理学
作者
Changsong Wu,Rong Jiang,L.C. Zhang,Y.C. Wang,Y. Chen,Yingdong Song
标识
DOI:10.1016/j.corsci.2022.110702
摘要
Fatigue crack growth (FCG) mechanisms of Ni-based superalloy FGH4098 at 650 ℃− 800 ℃ was investigated. The increased temperature and prolonged dwell time enhance the FCG rate by 2–3 orders of magnitude due to grain boundary (GB) oxidation. Characterization at the propagating crack tips with EBSD, TKD, TEM and EDX shows deformation (e.g. dislocations and stacking faults) mainly confines within γ channel along with orientation change within grains due to the severe deformation. Pre-formed oxides at uncracked GB fracture under stress, facilitating FCG process. A mechanism map of interaction between deformation-assisted GB oxidation and FCG is proposed.
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